Question

Many elements have non-integral atomic masses because

(a) they have isotopes

(b) their isotopes have non-integral masses 

(c) their isotopes have different masses

(d) the constituents, neutrons, protons and electrons' combine to given fractional masses

Answer 1

Correct option  (a) they have isotopes ,(c) their isotopes have different masses

Explanation:

because they have isotopes with different masses. Their average atomic mass is the weighted mean of their presence in nature ; eg, Cl³⁵ and, Cl³⁷ are present in ratio 3 : 1.

So,